Remove an unneeded semicolon

examples/dhcp_client.rs

@@ -95,6 +95,6 @@ fn main() {
         iface.poll_delay(&sockets, timestamp)
             .map(|sockets_timeout| timeout = sockets_timeout);
         phy_wait(fd, Some(timeout))
-            .unwrap_or_else(|e| println!("Wait: {:?}", e));;
+            .unwrap_or_else(|e| println!("Wait: {:?}", e));
     }
 }